Yeah that’s what I’m doing until new one arrives if it’s leak free I’ll keep the new one in case it goes againYou may be able to fix it with plastic welding as on mine it was made from PVC.
I finally replaces the pump with a diaphragm pump either Jabsco or Whale using an adaptor fitted on the mounting flange where the pump fits.
The flushing pump was a seperate electric pump feeding the filush pipe inlet just under the seat